# UEFN crash on startup assertion failed.

**URL:** <https://forums.unrealengine.com/t/uefn-crash-on-startup-assertion-failed/805583>\
**Category:** Issues and Bug Reporting\
**Tags:** crash, fortnite-creative, unreal-editor-for-fortnite, question, fortnite\
**Created:** [March 23, 2023, 3:24am UTC](https://forums.unrealengine.com/t/uefn-crash-on-startup-assertion-failed/805583 "2023-03-23T03:24:33Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![HalcyonKnight96](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/halcyonknight96/32/924312_2.png) [@HalcyonKnight96](https://forums.unrealengine.com/u/HalcyonKnight96)\
**Post date:** [March 23, 2023, 11:27am UTC](https://forums.unrealengine.com/t/uefn-crash-on-startup-assertion-failed/805583/5 "2023-03-23T11:27:59Z")

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Do you happen to have Riva Tuner or MSI Afterburner or some other hardware monitor/overclocking utilities running? These software often cause issues, so closing them would be recommended.

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